Bit-brace foe



yIINITED STATES PATENT OFFICE.

CHARLES C. PLAISTED, OF CHICOPEE, MASSACHUSETTS.

BIT-'BRACE FOR BORING OBLIQUELY T0 THE AXIS OF THE STOCK.

Specification of Letters Patent No. 17,891, dated July 28, 1857.

To all whom olf/may concern:

in oblique position; Fig. V, collars, connecting-link, and handle; Fig.VI, plan and section of the upper cylinder; Fig. VII, plan and sectionof the lower cylinder.

This instrument can be used in the same manner as the bit-stock incommon use, and is also intended for boring holes that are at thejunction of two planes or close to the corner of the walls of a roomwhere there is not sufficient sp ace to allow the common bitstock to beturned, as is often required to be done for bell-wires, gas fixtures,&c. To effect this I employ a universal joint, which occupies a positionbetween the bit-socket and the stock, its construction being asdescribed below, the main features of the invention consisting in theunited action of the collars, the universal joint, the connecting linkand handle.

The bow or crank S, Figs. I and II, is made in the usual manner, havinga loose knob or bearer -T, at the top. The collars A and B are fitted tothe up er and lower parts of the universal joint R, It', R in such amanner as to allow a free motion of these parts, while they serveasbearings for them; the connecting-link C prevents them from movingaround in the bit.

The link C, has a slot U at the end where it is fastened to the uppercollar A, by the screws D, D', and as the brace is inclined, more orless, the slot U traverses upon the ins or screws D D', the lower endof' the link (E) making a partial revolution at the same time upon thepins or screws E E', which are attached to the lower collar B. The linkC is curved to suit the collars, a art of it being cut out, as shown inFig. to allow the handle F to be closed or shut into it.

The handle F is fastened, near its lower end, by the pin G to the link,and has, near the same point, a protuberance with a flattened face, asat V, Fig. IV, by means of which, the cylinder H retains the handle F inits closed position when required.

The cylinder H, incloses the upper part of the universal joint R R andwhen the brace is in the position shown in Fig. I, it rests upon thelower collar B and can not move from this place. The cylinder has uponthe inside two grooves, one of them X, Fig. VI, parallel with its aXis,the other W, concentric. The cylinder H is ke t in its roper place bythe projecting stud ll, Figs. III and IV which fits the circular grooveW. By moving the cylinder H until the stud K passes into thelongitudinal groove X the downward motion of the cylinder is eected.

It will be observed that the surface of the cylinder H is at one sidefor its whole length flattened; this flattened side is, (during thesliding down of the cylinder), toward the handle F; it touches the lowerend of it, by passing on the corresponding flattened surface V of saidhandle F, and holds it parallel to the aXis of the brace, and within theconnecting link C.

The cylinder M, inclosing the bit-socket has an eccentric groove N, itsouter circumference nearly touching the inside of the cylinder at onepoint, while the opposite point opens in the outer circumference of thecylinder, as shown in Fig. VII. In setting the cylinder on the lowerpart R of the universal joint, the spring and latch P is kept close tothat part until it falls into the groove N; on giving the cylinder M aturn, the latch P enters the groove N, and as the latch projects atright-angles to the sprin both to the right and left, its projections hod the cylinder M, and also the bit which is provided, as usual, with anotch near its end.

A steady-pin J, is fastened to the part It and enters the groove in thecylinder H, thus giving greater stability to these parts.

When the cylinder H, is in contact with the collar B, the aXes ofrotation of the bit, lthe socket, and the stock are in the same ine.

What I claim is- 1. A bit-stock in which the socket or part that holdsthe bit revolves about its axis in axes of the bit and the stock areplaced and an oblique position With reference to the stock by means ofthe universal joint, or its equivalent, and the adjustable connecting- 5link extending from the socket to the stock. 2. In combination With theabove, I claim the cylinder or coupling by which the retained in lineWith eaoh other.

CHARLES C. PLAISTED. [1.. s.]

In presence of* VWARREN SMITH, MAX S. I. WILBE.

